Lifting jack for automobiles



- A. J. PERlmsvErAu LIFTING JNGK EUR AUTOMOBILES Filed muguet 5," zsm QWA .www /w r Uw@ SAM Wh.

Patented Jan. '26,' 1926.

r:UN1TE| A sffrm's @piacer ANDREWJ. PERKINS ANI) LESTER ISERKINs, OECHICAGO, ILLINOIS, AssIGNORs To YELLOW JACK-I'IMANUEAOTURING CO., OECHICAGO, ILLINOIS, A CORPORATION F ILLINOIS.

LIFTING JACK FOR AUTOMOBILES.

Application filed August 5, 1921. Serial No. 489,991:

To a-ZZ whom it' may concern Be it known that we, ANDREW J. PERKINS andLESTER PERKINs, citizens of the United States, and residents,respectively, of Chicago, in the county of Cook and State of Illinois,and of Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvement-s in Lifting Jacks forAutomobiles, of which the following is a full, clear, and exactspecification.

l Our invention relates to lifting jacks, and more particularly toportable jacks for use in connection with automobiles or other heavyvehicles.

-One of the objects of the invention is to provide a portable jack soconstructed that the same can be quickly adjusted to the proper heightof the axle.

A further object is to provide an easily manipulated foot levermechanism -within easy reach of thek operator for adjusting theextensible member.

These and other objects are obtained by providing a novel construction,the features of Vwhich are hereinafter more fully described and claimed.

In the accompanying drawings which` illustrate the preferred embodimentof our inventioni 'f Fig. 1 is a side elevational view of a lifting jackembodying our invention.

Fig. 2 is a rear elevational viewof Fig. 1. Fig. 3 is across sectionalview taken onthe lines 3-3 in Fig. 2, looking in the'direction of thearrows.

Fig. 4 is a detailed sectional top View of our lifting ack. p Asillustrated inthe drawings, our improved lifting jack comprises a.longitudinal frame member 10 preferably constructed of steel plates 11,which are secured together by a series of bolts 12, sleeves 13 beingcarried by these bolts, and spacing the plates 11 apart. The rear endsof the plates 11 have secured to their outer surfaces, brackets 14,which are angular in section. The horizontal portions of these bracketscarry U-shape securing members 15, in which is mounted an axle 16, whichcarries at its outer ends truck wheels 17, Cotter pins 18 being providedbetween the truck wheels and outer ends of the axle for the purpose ofsecuring the wheels in place. The forward end of the truck is carriedVby the castor wheel 19 mounted inthe bracket 20 which is pivotallysecured to the main frame 10.

The actuating mechanism for effecting the lifting of rthe jack propercomprises the usualy hand operating lever 21 pivoted-at 22.

to the forward end of the main frame 10 between the longitudinal sideplates 11. Pivotally mounted on the pivot 22' with the lever 21 is adrum 23 for the purpose hereinafter more fully described. The drum 23has formed integrally therewith a ratchet wheel 24 adapted to be engagedby a locking pawl v25 pivoted to the framev 10. The lever 21 haspivo-tally mounted adjacent its lower end, a normally spring pressedpawl 26 adapted to engage the ratchet wheel 24 in the normalmanipulation of the hand lever 21 in the raisingor lowering of the jack.Securely fixed to one side of the winding drum 23 is a flexible chain 27which extends rearwardly for the purpose hereinafter set forth. For amore vdetailed description of the above described mechanism see our U.S. Patent No. `1,322,941 dated November 25, 1919.

The vconstructionembodying our new invention comprises a main squarehollow standard kor lifting member 28 positioned between the side plates11 and held from displacementby the guiding plates 29 secured is anextensible member 30 provided .with a.

laterally extended lug 31 adapted to be engaged by a lever 32'pivoted tothe side of the main frame 10.1 The lug 31 is provided with an enlargedsquare headed portion on its outer end-thereof which forms a guard orguide for preventing the lever 32 from slippiiiglaterally off the lug 31when the extensible member 30 isfbeing raised by the lever. It will benoted that a U-shaped notch.10 is provided in the frame member 10Aadjacent the lifting member 30. This notch 10 isadaptedto receive thelug31 and thus sustain the weight of the extensible member 30 directly onthe frame member and also to permit the lug 3l to be engaged by thelever 32 when the extensible member 30 is in its lowermost position. Theforward end of the lever 32 is provided with a right angularly bentportion 34 adapted to be operated by the foot of the operator when theshown in the dotted lines in Figure 1. It will be further noted that therearward end of the lever 32 is notched at 35i in a manner to rest onthe head of the bolt 12 when said lever is in its lower position. rl`heextensible member 31 is provided with a series of vertically disposedteeth 36 adapted to receive a gravity pawl member 37 as shown in Fig. 3.The usual axle supporting bracket 31 is pivotally positioned in theupper end of the extensible member 30. The pawl member 37 is providedwith a normally vertically disposed shank 38 having spaced apertures 39adapted to loosely receive bolts 40. The bolts 40 are held in positionby an angular-ly bent member 41 spaced from the rear side of the tubularmember 28 by a spacer 42. The angularly bent member 41 and spacer 42 aresecured to the tubular member 28 by the bolts 43. The hollow member 28is provided with a notch portion 44 through which the tooth engagingportion of the gravity pawl 37 extends to engage the teeth 36. It willbe noted in the position shown in Fig. 3, that the tooth engagingportion 45 rests upon the base of the notch 44 of the tubular member 28when the gravity pawl 37 sustains or supports the extensible member 30.It will be further noted that the gravity pawl 37 is normally heldpressed against the teeth 36 by a weighted member 46 formed integrallyon the forwardly extended portion of the gravity pawl 37.

The tubular member 28 is lifted between the guiding plates 29 by meansof a flexible chain element 47 connected to a forwardly extending link48 fixed to the lower end of the tubular member 28. The flexible element47 is guided in its movements over a roller 49 journaled on one of thebolts 12 carried by the side plates 11. The flexible member 47 isconnected to the flexible chain 27 through a horizontal connecting link50.

The operation of the above described mechanism is as follows:

Assuming that an automobile is to be lifted, the jack is wheeled to thefront or rear of the machine as the case may be, and the extensiblemember 30 is positioned beneath the axle. The operator then, depressesthe angularly bent portion 34 of the lever 32 which lifts the extensiblemember 30 by means of the lever engaging the lug 31. This extensiblemember is thus elevated until it comes in Contact with the axle, asshown in the dotted lines in Fig. 1. Afterv the extensible member 30 hasbeen elevated to the desired position by the lever 32, the lever returnsto its normal position shown in the full lines in Fig. 1. The lifting isdone by the movement of the lever 21 about its pivot 22, the pawl 26engaging the ratchet wheel 24 and rotating this ratchet wheel, therebyrotating the drum 23 carrying with it the fiexible chain 27 in themanner to elevate the hollow member 28 through the connections and 47 tothe base of said hollow member. l/Vhen the operator desires to lower theextensible member 30 with respect to the hollow member 28, he disengagesthe gravity pawl 37 from the teeth 36 of the extensible member 30 bylifting the weight 46 upwardly and thus swinging the gravity pawl 37rearwardly about its shank 38, per init-ting the extensible member 30 todrop to its lowermost position. By this construction it will be seenthata very simple, efficient and durable device has been provided andone which can be easily operated.

While we have described in the above specification one embodiment whichour inventio-n may assume in practice, it should be understood that theinvention is capable of modification, and that modification may beemployed without departing from the spirit and scope of the invention asexpressed in the following claims.

Ve claim:

1. In a lifting jack a longitudinal frame, a lifting member mounted insaid frame, an extensible member mounted in said lifting member, meansincluding a pawl having a vertically extending shank, said pawl beingpivoted on the lower edge of said shank on said lifting member forlocking said extensible member in adjusted positions, and meansextending through said shank and secured to said lifting member forguiding said pawl in its movement.

2. In a lifting jack, a longitudinal frame, a lifting member adjustablymounted in said frame, an extensible member adjustably mounted withinsaid lifting member and a pawl pivoted to said lifting member adapted toslidably engage the upper end of said lifting member for adjustablysupporting said extensible member. Y

In testimony whereof we aflix our signatures.

ANDREIV J. PERKINS. LESTER PERKINS.

